Slope gauge



FIG. 1 is a perspective view showing my new design;

FIG. 2 is a top elevational view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a side plan view thereof;

FIG. 5 is a back plan view thereof; and,

FIG. 6 is a back elevational view thereof. 

The ornamental design for a slope gauge, as shown and described. 